ASBOG EXAM REVIEW PRACTICE QUESTIONS AND ANSWERS

ASBOG EXAM REVIEW PRACTICE QUESTIONS AND ANSWERS What does it mean when you have topographic contours on a 1:24,000 scale base map that are roughly circular and have hachures on the counters? - ANS-They represent a closed depression You have a base map at a scale of 1:6,000 and you need to represent the information you obtained during a field investigation of a site that is one square mile, that included mapping of your site as well as subsurface exploration results. What do you need to do to the map to make it work? - ANS-Use a larger scale map because it covers a smaller area If you have a map that is at a scale of 1:24,000 and you want to draw a cross section with a 10 times exaggeration, what will the vertical scale be? - ANS-1" = 200' What is the approximate exaggerated dip if the vertical scale is exaggerated 10 times and the true dip is 30*? - ANS-80* What do you do if you have forgotten to research the current magnetic declination before you go to the field to investigate and map a site for a geologic mapping project? - ANS-Align your map with two planimetric features and measure the declination with your compasss. Location and elevation input into your GIS program comes from your GPS system. The maps generated by this system are based on a reference datum. If the maps were created in 1972, what do you need to do to use them with the data output from your GPS system? - ANS-Make the conversion from NAD27 to NAD83. For a strike and dip of N25*E, 15*N, what is the attitude of the bed in terms of the azimuth? - ANS- 205, 15 MAP NEEDED PAGE 3: What is the strike and dip of the bed? - ANS-